Fabrication of embossed metallic plates



May 3, 1932. A. D. wooD 1,856,898

FABRICATION OF EMBOSSED METALLIC PLATES Filed Marchv 30, 1928 2 Sheets-Sheet l FIC-7i I A A A A A A A A A A A V A A A AAA A A A A A A f A A A A A A A A A A A A A A A A A A A A A A A A v A A A A A A A A A A A A A A A A A A A A A A A A A A A A ,A A A A A A A A A A A A A A A A A A ,Ah/A A Aw A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A w A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A .A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A .AUA A A A w A A A A A A A A A A A A A A A A A' A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A W1 TNEssEs lf? INVENTOR;

Y Byzamnmooz,

WW @M ATTORNEYS.

May 3, 1932. vA. D. woo'D 1,856,898

FABICATION oF EMBossED METALLIC PLATES v Filed March 30, 1928 I 2 Sheets-Sheet 2 WITNEssEs zj ji INVENTOR.-

/laz 1)- /lfood,

Patented May 3, 1932 UNITED STATES PATENT oEFlcE l ALAN D. WOOD, OF LOWER MERION TOWNSHIP, MONTGOMERY COUNTY, PENNSYLVANIA FABRICATION OF EMBOSSED METALLIC PLATES Application filed March'SO, 1928. Serial No. 265,928.

This invention relates to fabrication of metallic tread or wear plates of a type characterized by roughened surfaces formed by multifold projections or embossments. More 5 specifically speaking, my invention is concerned with production of tread plates from sheet metal of lighter gages. Considerable difficulty has been experienced heretofore in the fabrication of light gage embossed plates X due to the tendency of the metal to puncture, fracture or buckle incidental to the -setting up of the surface embossments by passage between opposing die rollers. The aim of my invention is to overcome the difficulty 4rel5- ferred to, and this I accomplish by concurrently passing1 several blank metallic sheets between the die rollers so as to secure a cushioning effect with assurance of uniform displacement of the metal to the avoidance of puncturing, fracturing or buckling, and with attendant production of as many finished plates having embossments distinguished by variation in sharpness of outline.

With reference to the drawings, Figs. I and II illustrate strips of two different kinds of embossed plates simultaneously fabricated in'accordance with my invention. L

Fig. III shows a fragment of the strip of Fig. I on a larger scale. Fig. IV is a detail cross section taken as indicated by the arrows IV-IV in Fig. III.

Figs. V and VI are views similar to Figs. III and IV, of the strip illustrated in Fig..II. Fig. VII shows a cooperating pair of die rollers which I employ to forge the embossed plates; and,

Fig. VIII is a fragmentarydetail sectional view, to a still larger scale, showing the oper-l ation of the die rollers.

In carrying out my invention I employ a pair ofdie rollers such as illustrated at 10, 11

in Figs. VII and VIII. As shown, one of these die rollerswhich may for convenience be termed the pattern or impress rollerhas surface recess/es or indentations 12 (in the present instance diamond or lozenge shaped)l corresponding to the configuration of the projections or embossments desired in the finished plates; While the opposing roller is plain surfaced. Between these rollers 10, 11 50 I concurrently pass several blank metallic sheets 13, 14-for example two, which may be of uniform gage as shown at the right of Fig. VIII-in superimposed relation, the

sheets being preferably preheated to fscilitate ready forging of the metal. As the sheets 13, 14 traverse the nip of the rollers 10, 11, it will be seen that the metal of the pper sheet 13 is forced into the recesses or 1ndentations 12 of the upper` roller 10, and that '60 uniform flow ofthe metal of the upper sheet 13 is insured by the cushioning effect of the lower sheet 14 running againstthe plain roller 11. It will moreover be noted that a corresponding compensative displacement of the metal of the lower sheet 14 takes place at the same/time As a consequence of the described action, the upper of the two plates13, 14(takes on a more or less corrugated cross section, andis characterized with sharply defined surface projections 16 (Figs. I, III and IV) by 'virtue of having run in direct contact with the upper or impressed roller 10. The lowermost plate 14 on the other hand remains perfectly flat throughout, i. e. with a smooth bottom surface as a consequence of contact with the plain roller 11 and is further distinguished by virtue of having embossments 17, which, as shown in Figs. II, V and VI, are more rounded and thus more vaguely defined than those of the first plate 13. In this very simple manner I am able to roll.- without dangerg of puncture, fracture or buckling-very thin metallic sheets, and concurrently produce embossed plates in multi- 35 ple distinguished by roughened surfaces differing in sharpness as regards the outlines of their projections or embossments, but both highly attractive and neat in appearance. The number of sheets,rolled at one time may vary 0 lHaving thus described my invention, I claim:

1. The method of fabricating embossed plates by concurrently passing superimposed metallic blank sheets betwen a pattern-surfacedroller and an opposing plain-surfaced roller with production, by a single pass, of a finished plate distinguished by sharply defined corrugations, with the other sheets cushioning said finished plate to the avoidance of puncturing and being themselves characterizedby face projections of successively diminishing degree.

2. The method of fabricating embossed plates by concurrently passing several metallic blank sheets in superimposed relation between a pattern or impress roller and an opposing plain surfaced roller with production, by a single pass, of a corresponding number of finished plates distinguishedby surface projections varying in sharpness of outline.

3. The method of fabricating embossed plates by concurrently passing several metallic blank sheets in superimposed relation between a pattern or impress roller and an opposing plain surfaced roller with production, by a single pass, of a corresponding number vof finished plates, some of them corrugated, and all distinguished by surface projections varying in sharpness of outline.

4. The method of fabricating embossed plates by concurrently passing two metallic blank sheets in superimposed relation between a pattern or impress roller and an opposing plain surfaced roller, so that the sheet running in contact with the plain surfaced roller acts as a cushion for the other to insure uniform flow of the metal of the latter into conformity with the surface of the pattern or impress roller and at the same time blank metallic sheets between opposing pat- I 

